CN102052066B - Dynamic seal pressing method and device for improving complex perforation pressing crack effect - Google Patents
Dynamic seal pressing method and device for improving complex perforation pressing crack effect Download PDFInfo
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- CN102052066B CN102052066B CN200910218904.0A CN200910218904A CN102052066B CN 102052066 B CN102052066 B CN 102052066B CN 200910218904 A CN200910218904 A CN 200910218904A CN 102052066 B CN102052066 B CN 102052066B
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Abstract
The invention relates to dynamic seal pressing method and device for improving complex perforation pressing crack effect in petroleum development. High-energy gas generated by complex perforation can be sealed in a perforating section, effective pressure action time can be prolonged and capability for doing work on stratum pressing crack can be strengthen. In the dynamic seal pressing method, shafts at the upper end and the lower end of the perforating section of a composite perforating gun are sealed by gas generated by explosive explosion and gunpowder detonation when the composite perforating gun carries out pressing crack. The dynamic seal pressing device comprises a tubular body which is connected with the end part of the perforating gun, wherein a pressure relief hole with a plug piece is arranged on the tubular body; an inner cavity of the tubular body is provided with an explosive column, first-class explosive and second-class explosive; the first-class explosive is packaged outside the explosive column; the second-class explosive is isolated from the explosive column; and an explosion isolating plate with a sieve mesh is arranged between the second-class explosive and the first-class explosive. After the explosive column is exploded, the first-class explosive is ignited, and the first-class explosive ignites the second-class explosive. The periphery of the shaft near the dynamic seal pressing device is full of the generated high-pressure gas.
Description
Technical field
The invention belongs to oil exploration and development fields, is a kind of for improving dynamic seal pressure method and the device thereof of fracturing effect of composite perforation, is specially adapted to the composite gun perforation operation of the techniques such as cable or tubing transmission.
Background technology
In Oil/gas Well exploration and development field, composite gun perforation, as a kind of effective method for increasing of perforating oil gas well completion, is widely applied in In Oil Field Exploration And Development.The know-why of composite gun perforation is that the perforating bullet of arranging according to certain Kong Mi and phase rule is assemblied in perforating gun, and in rifle, is uniformly distributed a certain amount of stick of filling.During perforation, first by perforating bullet blast generation energy-gathering jetting, penetrate in advance casing wall and form duct between stratum and pit shaft, the impact energy of then being exploded by perforating bullet and heat energy excite stick burning to produce dynamic high-pressure gas, first these gases at high pressure enter in mineshaft annulus by the relief hole on preforation tunnel and the body of a gun, in pit shaft, set up high pressure and go forward side by side into perforation tunnel, pressure break acting is implemented in stratum.Composite gun perforation can form the vast fracture network that not affected by geostatic stress near wellbore zone, can eliminate the pollution to stratum of drilling well, well cementation and perforation, improves the communication state of pit shaft and oil reservoir and the osmotic effect on stratum, improves oil well productivity and life-span.But for different well ' s conditions, stratum condition and different gun perforation process, the effect of composite gun perforation operation is differentiated, such as for the more shallow well of well depth, because fluid column is low, wellbore pressure is little, the relative wellbore pressure pressure reduction of gas pressure that composite gun perforation produces is very large (such as 1000 meters of wells, the about 10MPa of head of liquid, and composite gun perforation generally gas surge pressure at 50 ~ 60 MPa, pressure differential reaches 40 ~ 50MPa), large pressure reduction can cause gases at high pressure to flow to well head or the shaft bottom low-pressure area axial high speed of resistance minimum, the loss of energy makes perforated interval gas pressure fast-descending, the energy that enters stratum reduces, action time is short, pressure break Efficiency Decreasing.The well low for permeability, rock is fine and close, strata pressure is high, formation resistance is large, and gas pressure can not enter stratum fast, wellbore pressure is raise, pressure reduction increases, and energy also can, to the little well head of resistance and the loss of shaft bottom low-pressure area direction high speed pay-out build-up of pressure, reduce pressure break efficiency.For different gun perforation process, also can affect pressure break efficiency, such as for cable transmission, the general maximum of perforation segment length is no more than 4 meters, by the down-hole resulting curve of p-T tester, can know that the effective pressure duration of 4 meters of rifles is 2～3 times of 1 meter of rifle, perforated interval center is shorter from the distance of perforating gun rifle head and gun breech, perforating gun center pressure drop speed is just faster, and fracturing effect is just more bad.Up to now, do not see the report to these problem-solving approaches both at home and abroad.
Summary of the invention
Problem to be solved by this invention is: provide a kind of for improving dynamic seal pressure method and the device thereof of fracturing effect of composite perforation, the high energy gas shutoff that the method and device can produce composite gun perforation is in perforated interval, extend effective pressure action time, increase the gas flow that enters stratum, strengthen the acting ability to formation breakdown.
The thinking that the present invention addresses the above problem is: the high loading rate detonation gas that utilizes blast and burning to produce is set up dynamic high-pressure district at the upper and lower two ends of perforated interval, thereby the gases at high pressure that suppress composite gun perforation are to the little well head of resistance or the release of shaft bottom low-pressure area.
For addressing the above problem, provided by the inventionly for improving the dynamic seal pressure method of fracturing effect of composite perforation, be: when composite perforation gun is implemented pressure break, the gas shutoff composite perforation gun upper end producing by explosive charge and gunpowder detonation or the pit shaft of composite perforation gun upper end and lower end.
Described pass through gas shutoff composite perforation gun upper end that explosive charge and gunpowder detonation produce or the pit shaft of composite perforation gun upper end and lower end can carry out like this:
1) in the upper end of composite perforation gun, or in the top and bottom of composite perforation gun, dynamic seal press device is installed, explosive, one-level gunpowder and secondary gunpowder are housed in this dynamic seal press device;
2) composite perforation gun arrives downhole perforation position, and detonating fuse is ignited explosive in dynamic seal press device and the perforating bullet in composite perforation gun successively;
3) the one-level gunpowder in dynamic seal press device that ignites of the explosive charge in dynamic seal press device, the detonation gas that one-level gunpowder produces is full of near dynamic seal press device in pit shaft;
4) the secondary gunpowder igniting in dynamic seal press device after the one-level gunpowder detonation in dynamic seal press device, the detonation gas that secondary powder burning produces continues to be full of near pit shaft dynamic seal press device, maintains near wellbore pressure to the pressure break of dynamic seal press device and completes.
The detonation gas pressure that above-mentioned one-level gunpowder produces is or/and the detonation gas pressure that secondary gunpowder produces is preferably not less than the pressure that composite perforation gun is implemented pressure break.Certainly, if one-level is or/and the detonation gas pressure that secondary gunpowder produces is less than the pressure that composite perforation gun is implemented pressure break, also can play certain envelope pressure effect, for example, be slightly less than the pressure that composite perforation gun is implemented pressure break, its envelope pressure effect is also pretty good.
The time that above-mentioned one-level gunpowder ignites preferably synchronizes with the ignitor firing time of perforating bullet gunpowder.
Preferred plan is: control the speed that secondary gunpowder detonation gas discharges to pit shaft, detonation gas sum action time that one-level gunpowder and secondary gunpowder are produced is not less than the action time of the detonation gas of composite gun perforation generation.
The present invention for improving the dynamic seal press device of fracturing effect of composite perforation is: have a tubular body, the end of this tubular body is connected with the end of composite perforation gun by joint, tubular body is provided with the relief hole with jam, tubular body inner chamber is provided with explosive column, one-level gunpowder and secondary gunpowder, wherein one-level gunpowder wraps in explosive column outside, between one-level gunpowder and explosive column, be provided with flame proof pipe, secondary gunpowder and explosive column isolation, between secondary gunpowder and one-level gunpowder, be provided with the flame proof plate with sieve aperture, detonating fuse inserts in explosive column.
Above-mentioned flame proof pipe preferably adopts metal material.
The sieve diameter of the above-mentioned flame proof plate with sieve aperture is 8～24 millimeters.With sieve aperture, control or adjust the supplementary speed of pressure and duration.
During composite gun perforation, detonating fuse is first ignited the explosive column of dynamic seal press device, then ignites the perforating bullet of composite perforation gun.After explosive column blast by the flame proof pipe one-level gunpowder that ignites, the detonation gases at high pressure that one-level gunpowder produces are full of near dynamic seal press device in pit shaft, and by the secondary gunpowder that ignites of the flame proof plate with sieve aperture, the decline of wellbore pressure after the supplementary one-level powder burning of high pressure producing after the detonation of secondary gunpowder, near making to seal pressure device, mineshaft annulus continues in high pressure conditions, that is: near pit shaft envelope pressure device is implemented to gases at high pressure shutoff, and shutoff time duration is finished to composite gun perforation, stop composite gun perforation detonation gas to pit shaft axial diffusion, thereby improve the fracturing effect of composite gun perforation.
The present invention is owing to adopting gases at high pressure to carry out the pit shaft of shutoff composite gun perforation section termination, stoped the diffusion of composite gun perforation detonation gas to pit shaft outlet, not only greatly reduced the gas energy loss of composite gun perforation, make concentrated the acting in perforated interval of gas energy of composite gun perforation, give full play to the potential of composite gun perforation, and simple to operate, be convenient to implement, and can not leave any obstacle to subsequent handling.Dynamic gas provided by the invention envelope pressure device is simple in structure, can be connected with various forms of composite perforators, also can be connected with the priming device such as cable halter, caber initiator, pressure detonator.The present invention can not only play the effect of dynamic seal pressure, and can supplement composite gun perforation energy, improves pressure waveform, significantly extends the pressure-acting time, reaches better fracturing effect.
Accompanying drawing explanation
Fig. 1 is action principle figure of the present invention.
Fig. 2 is the structure chart of dynamic seal press device of the present invention.
Fig. 3 is the structure chart of flame proof plate in Fig. 2.
The specific embodiment
According to construction requirement, if once complete perforation at a plurality of oil reservoirs, just multi-openings rifle need to be coupled together, form perforation pipe string, each perforating gun is aimed at an interval.Dynamic seal press device of the present invention can be connected to the two ends up and down of an interval composite perforation gun, also can be connected to the two ends up and down of each interval composite perforation gun with a perforation of a plurality of intervals.
Fig. 1 has provided the action principle of the present invention at an interval.The two ends of perforating gun 1 respectively connect a dynamic seal press device 2, during composite gun perforation, they are transferred to the desired location of pit shaft 3, and oil reservoirs 4 are implemented to composite gun perforation.Near wellbore pressure before perforation perforating gun 1 is that the pressure differential that P1(is produced by perforating gun height can be ignored), the detonation gas pressure producing during perforating gun perforation is P2, because P2 is greater than P1, if do not take close measure, composite gun perforation detonation gas can, to pit shaft axial diffusion, cause the energy loss of composite gun perforation detonation gas.In dynamic seal press device 2 of the present invention, explosive column and gunpowder are housed, they are detonated in composite gun perforation, the high pressure that near the pit shaft mineralization pressure of the high loading rate detonation gas producing perforating gun two ends is P3, P3 is not less than P2, like this, not only stop the detonation gas of composite gun perforation to pit shaft axial diffusion, and can supplement composite gun perforation energy, reached better fracturing effect.Preferably be not less than the action time of the detonation gas of composite gun perforation generation the action time of the detonation gas that dynamic seal press device 2 produces.
Fig. 2 has provided a concrete structure of dynamic seal press device of the present invention.Dynamic seal press device has a tubular body 21, and the end of tubular body 21 can be connected with upper end or the bottom of composite perforation gun by lower contact 22a or top connection 22b.The inner chamber of tubular body 21 is divided into upper semisection and lower semisection, flame proof plate 23 with sieve aperture 23d is located between the upper semisection and lower semisection of tubular body 21 inner chambers, explosive column 24 and one-level gunpowder 25 are contained in the lower semisection of tubular body 21 inner chambers, secondary gunpowder 26 is contained in the upper semisection of tubular body 21 inner chambers, is located at the lower semisection of tubular body 21 with the relief hole 27 of jam.The quantity of relief hole 27 and large I determine according to the shutoff pressure of setting and LOADING RATES.One-level gunpowder 25 wraps in explosive column 24 outsides, is provided with flame proof pipe 28 between the two, and detonating fuse 29 passes from the explosion arrestment pipe 30 at secondary gunpowder 26 centers, then inserts explosive column 24.Be positioned at the dynamic seal press device of perforating gun upper end, its detonating fuse also will continue to extend to perforating gun.
The structure of flame proof plate 23 is as shown in Figure 3: flame proof plate 23 comprises the centre bore 23a that passes through for detonating fuse, is positioned at the solid area of isolation 23b outside centre bore 23a and is positioned at the sieve aperture region 23c outside solid area of isolation, wherein solid area of isolation 23b is by explosive column 24 and 26 isolation of secondary gunpowder, and sieve aperture region 23c is between secondary gunpowder 26 and one-level gunpowder 25.
During composite gun perforation, the first ignition charge post 24 of detonating fuse 28 is that the detonation gas of one-level gunpowder 25 is washed the jam in relief hole 27 open by the flame proof pipe 28 one-level gunpowder 25 that ignites after explosive column 24 blast, by relief hole 27, enter near mineshaft annulus, form a higher-pressure region.Flame proof pipe 28 plays a part to delay to ignite, and makes the rate of climb of shutoff pressure and the rate of pressure rise of composite gun perforation keep synchronizeing.The sieve aperture 23d of the detonation of one-level gunpowder by the flame proof plate secondary gunpowder 26 that ignites, its detonation gas enters near mineshaft annulus by sieve aperture 23d and the relief hole 27 of flame proof plate 23.The sieve aperture 23d of flame proof plate plays a part to control detonation rate of gas release, make near the mineshaft annulus of secondary gunpowder detonation gas continuous action envelope pressure device, and the fast-descending of wellbore pressure after supplementary one-level powder burning, guarantee near the long action time of the Duration Ratio composite gun perforation effective pressure of wellbore annulus pressure dynamic seal press device.In addition, the gases at high pressure that secondary gunpowder produces can also supplement composite gun perforation energy, reach better fracturing effect.
Claims (7)
1. for improving the dynamic seal pressure method of fracturing effect of composite perforation, when it is characterized in that composite perforation gun is implemented pressure break, the gas shutoff composite perforation gun perforated interval upper end producing by explosive charge and gunpowder detonation or the pit shaft of composite perforation gun perforated interval upper end and lower end, its step is as follows:
1) in the upper end of composite perforation gun perforated interval, or in the top and bottom of composite perforation gun perforated interval, dynamic seal press device is installed, explosive, one-level gunpowder and secondary gunpowder are housed in this dynamic seal press device;
2) composite perforation gun arrives downhole perforation position, and detonating fuse is ignited explosive in dynamic seal press device and the perforating bullet in composite perforation gun successively;
3) the one-level gunpowder in dynamic seal press device that ignites of the explosive charge in dynamic seal press device, the detonation gas that one-level gunpowder produces is full of near dynamic seal press device in pit shaft;
4) the secondary gunpowder igniting in dynamic seal press device after the one-level gunpowder detonation in dynamic seal press device, the detonation gas that secondary powder burning produces continues to be full of near pit shaft dynamic seal press device, maintains near wellbore pressure to the pressure break of dynamic seal press device and completes.
2. according to claim 1 for improving the dynamic seal pressure method of fracturing effect of composite perforation, it is characterized in that controlling the speed that secondary gunpowder detonation gas discharges to pit shaft, detonation gas sum action time that one-level gunpowder and secondary gunpowder are produced is not less than the action time of the detonation gas of composite gun perforation generation.
3. according to claim 1 for improving the dynamic seal pressure method of fracturing effect of composite perforation, it is characterized in that the time that one-level gunpowder ignites synchronizes with the ignitor firing time of perforating bullet gunpowder.
4. implement the claims the dynamic seal press device of method described in 1, it is characterized in that having a tubular body (21), the end of this tubular body is connected with the end of composite perforation gun by joint, tubular body is provided with the relief hole (27) with jam, tubular body inner chamber is provided with explosive column (24), one-level gunpowder (25) and secondary gunpowder (26), wherein one-level gunpowder (25) wraps in explosive column (24) outside, between one-level gunpowder and explosive column, be provided with flame proof pipe (28), secondary gunpowder (26) and explosive column (24) isolation, between secondary gunpowder (26) and one-level gunpowder (25), be provided with the flame proof plate (23) with sieve aperture, detonating fuse (29) inserts in explosive column (24).
5. envelope pressure device according to claim 4, the inner chamber that it is characterized in that tubular body (21) is divided into upper semisection and lower semisection, the flame proof plate (23) of band sieve aperture (23d) is located between the upper semisection and lower semisection of tubular body (21) inner chamber, explosive column (24) and one-level gunpowder (25) are contained in the lower semisection of tubular body inner chamber, secondary gunpowder (26) is contained in the upper semisection of tubular body inner chamber, is located at the lower semisection of tubular body (21) with the relief hole (27) of jam.
6. envelope pressure device according to claim 4, is characterized in that sieve aperture (23d) diameter of flame proof plate (23) is 8～24 millimeters.
7. according to the envelope pressure device described in claim 5 or 6, it is characterized in that flame proof plate (23) comprises the centre bore (23a) that passes through for detonating fuse, is positioned at the outer solid area of isolation (23b) of centre bore (23a) and is positioned at the sieve aperture region (23c) outside solid area of isolation, wherein solid area of isolation (23b) is by explosive column (24) and secondary gunpowder (26) isolation, and sieve aperture region (23c) is positioned between secondary gunpowder (26) and one-level gunpowder (25).
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103225498B (en) * | 2013-04-19 | 2015-11-18 | 中国石油天然气股份有限公司 | Multi-stage composite deep penetration perforating device |
| CN103590790B (en) * | 2013-11-26 | 2016-06-15 | 西安通源石油科技股份有限公司 | A kind of analogue perforation bullet, composite perforator and perforating job method |
| CN108374651B (en) * | 2017-12-05 | 2023-07-07 | 西安物华巨能爆破器材有限责任公司 | Liquid inlet explosion-proof explosion-propagation device for perforation of oil and gas well |
| CN108222911B (en) * | 2017-12-27 | 2020-03-20 | 中国海洋石油集团有限公司 | Horizontal open hole well production increasing completion pipe string and combined operation method |
| CN109138957B (en) * | 2018-07-17 | 2024-06-25 | 屈波 | Liquid explosive injection and detonation device for oil and gas reservoir explosion fracturing |
| CN109339761B (en) * | 2018-11-16 | 2024-06-25 | 屈波 | Fluid injection and detonation device for hydrocarbon reservoirs |
| CN110306966B (en) * | 2019-07-22 | 2024-06-21 | 屈波 | Liquid explosive injection and in-situ explosion fracturing device for oil-gas cased well |
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| CN2630492Y (en) * | 2003-06-18 | 2004-08-04 | 西安石油学院 | Perforation-strong overpressure balance symmetric fracturing device |
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| US7487827B2 (en) * | 2005-02-18 | 2009-02-10 | Propellant Fracturing & Stimulation, Llc | Propellant cartridge with restrictor plugs for fracturing wells |
| CN201531256U (en) * | 2009-11-11 | 2010-07-21 | 西安通源石油科技股份有限公司 | Dynamic seal press device for improving fracturing effect of composite perforation |
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Patent Citations (5)
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| CN2630492Y (en) * | 2003-06-18 | 2004-08-04 | 西安石油学院 | Perforation-strong overpressure balance symmetric fracturing device |
| CN2630493Y (en) * | 2003-06-18 | 2004-08-04 | 王安仕 | Multi-stage pulse perforation fracturing composite apparatus |
| US7487827B2 (en) * | 2005-02-18 | 2009-02-10 | Propellant Fracturing & Stimulation, Llc | Propellant cartridge with restrictor plugs for fracturing wells |
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